<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
  <meta charset="UTF-8" />
  <title>登录</title>
</head>
<body>
<div th:if="${param.error}">
  无效的账号或密码
</div>
<div th:if="${param.logout}">
  你已注销
</div>
<form th:action="@{/login}" method="post">
  <div><label>账号:<input type="text" name="username" /></label></div>
  <div><label>密码:<input type="password" name="password" /></label></div>
  <div><input type="submit" value="登录" /></div>
</form>
</body>
</html>